{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50027", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.066Z", "datePublished": "2024-10-21T19:39:31.141Z", "dateUpdated": "2026-08-05T11:41:03.310Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:03.310Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: core: Free tzp copy along with the thermal zone\n\nThe object pointed to by tz->tzp may still be accessed after being\nfreed in thermal_zone_device_unregister(), so move the freeing of it\nto the point after the removal completion has been completed at which\nit cannot be accessed any more." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The dangling `tz->tzp` is reached through the thermal generic-netlink family (AF_NETLINK socket, init netns) and the world-readable `/sys/class/thermal/thermal_zoneN/{slope,offset,k_*,sustainable_powe r}` attributes, and the free side is a local device/driver teardown; no remote peer parses any of this data.\nAC:L - The attacker drives the surviving side of the race itself — a tight loop of `THERMAL_GENL_CMD_TZ_GET_TEMP`/`TZ_GET_TRIP` pins the zone with `get_device()` while unregistration proceeds — and the freed window spans `device_del()` teardown, a netlink multicast delete notification and an unbounded `wait_for_completion()`, which is wide enough to reliably reclaim the 48-byte `tzp` from the heavily-trafficked kmalloc-64 cache; the attempt is repeatable at will.\nPR:L - None of the thermal genl ops set `GENL_ADMIN_PERM` (`thermal_genl_ops[]`), and `thermal_zone_get_by_id()` performs no capability check, so an ordinary unprivileged local user obtains and holds the zone reference; the `tzp` sysfs show handlers are likewise world-readable at 0444/0644.\nUI:N - The attacker's netlink polling loop needs no cooperation from any other user, and the unregistration it races is ordinary system activity (charger/battery power-supply removal, transceiver or CPU-package zone teardown, driver rebind) rather than an action the attacker must induce a victim to perform.\nS:U - The corrupted memory is kernel slab memory managed by the same kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `thermal_zone_get_slope()`/`thermal_zone_get_offset()` and the power-allocator PID code read the freed `tzp`, and those values propagate into the temperature returned over netlink and sysfs, disclosing whatever kernel object has since been allocated into the reclaimed kmalloc-64 slot; as with any UAF the stale pointer generalises into an arbitrary-read primitive once the attacker controls the reallocation.\nI:H - The dangling pointer is also written through — `estimate_pid_constants()`/`get_sustainable_power()` store into `tz->tzp->k_po`, `k_pu`, `k_i` and `sustainable_power`, and the `sustainable_power`/`k_*`/`slope`/`offset` sysfs store handlers assign directly through `tz->tzp` — giving a heap write into a reallocated, groomable kmalloc-64 object and thus corruption of adjacent kernel structures usable for control-flow hijack and privilege escalation.\nA:H - Dereferencing the freed `tzp` (plus the `def_governor` fallback entering `power_allocator_manage()` with `tz->governor_data` already NULLed) produces slab use-after-free corruption and oops/panic, and an unprivileged user can retry the race indefinitely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thermal/thermal_core.c" ], "versions": [ { "version": "3d439b1a2ad36c8b4ea151c8de25309d60d17407", "lessThan": "eabe285e1c629a719d6e68fc319939c63b83bf22", "status": "affected", "versionType": "git" }, { "version": "3d439b1a2ad36c8b4ea151c8de25309d60d17407", "lessThan": "bdb0d40507c85bee33c2a71fde7b2e857346f112", "status": "affected", "versionType": "git" }, { "version": "3d439b1a2ad36c8b4ea151c8de25309d60d17407", "lessThan": "827a07525c099f54d3b15110408824541ec66b3c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thermal/thermal_core.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.60", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.60" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.11.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/eabe285e1c629a719d6e68fc319939c63b83bf22" }, { "url": "https://git.kernel.org/stable/c/bdb0d40507c85bee33c2a71fde7b2e857346f112" }, { "url": "https://git.kernel.org/stable/c/827a07525c099f54d3b15110408824541ec66b3c" } ], "title": "thermal: core: Free tzp copy along with the thermal zone", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50027", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-22T13:26:36.583525Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:28:46.345Z" } } ] } }